G44.00
Header — not billableCluster headache syndrome, unspecified
The ICD-10 code for cluster headache syndrome, unspecified is G44.00.
G44.00 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 2 more specific codes below.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Ciliary neuralgia
- Cluster headache NOS
- Histamine cephalgia
- Lower half migraine
- Migrainous neuralgia
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- G44.01Episodic cluster headachenon-billable header
- G44.02Chronic cluster headachenon-billable header
- G44.03Episodic paroxysmal hemicranianon-billable header
- G44.04Chronic paroxysmal hemicranianon-billable header
- G44.05Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)non-billable header
- G44.09Other trigeminal autonomic cephalgias (TAC)non-billable header
- G44.00Cluster headache syndrome, unspecifiednon-billable header